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Results from laboratory experiments conducted with upstream terrace sediments (a) and downstream terrace sediments (b). Experiments began at a 10-h residence time (θH = time to convey 1 pore volume) that was incrementally reduced to 5 h and 2 h (delineated with vertical lines). For these normalized results, influent dissolved Fe(II) concentrations ranged from 9.7 to 10.9 mM in panel a and from 9.4 to 10.3 mM in panel b.
